Connecting-rod reamer and the like.



A. A. MAHTELL. CONNECTING BO REAVIER AND THE LIKE. APPLICATION FILEDYOCT. 5, i911- @mmm Jun@ 18,' 19m.

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vA. A. WIARTELLn CONNECTING ROD REANIER AND THE UKE. APPLlcATIoN man 0915, :911.

l 395,330 Mtentd Jun@ 18, 191@ 6 SHELTS-SHEET 2.

A. A. Mmmm.; CONNECTING ROD BEAMER AND THE LIKE.v

APPLICATION FIL ED OCT. 5. T917.

6 SHEETS-SHEET a.

A. A. MARTEL'L. vCONNECTING ROD REA-MER AND THE-LIKE.

APPLICATION FILED OCT. 5', 1917.

Patented June I8, IQI@ AMA; MAHTELL. CONNECTING HOD BEAMER AND 'HE LIKE.

- APPLlcATrpN man ocT. 5, 1911.`

Pmented June 18, 1918.

6 SHEETS-SHEET 5.

W; @MM/f Maw 11.11.. MARTELL. CUNNECTING @0D H 'RAND THBJKE. APPLICATION FIL OCT. 5.1911.

Patented June 18, 1918.

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' dent .of the city of 'llloonsockeh lil v Be it lrnown that llj ALBERT annnn'r a. ifranrnrir.,

naniirriorunrnn nnonn istanti;

terrasse.

The principal object of this inventionis that of a method, and also an apparatus byl I in part be which the method may be carried out, for aiming bearings in the ends of connecting rods and the like, with the connecting rod under pressure in the direction of itslength.

A further and equally important'fiobject ofthe present invention is the method and apparatus for maintaining a connecting rod in such position that the `axis of the bearing at one end will be exactly parallel to the axis to which the bearing at the other end is bein reained whereby when the connecting mi' is finished .the ben-ings win te BX- actly parallel.

Jlenother object of the present-invention is' an `apparatus of the character specified `wherein the connecting rod is maintained `under distributed frances .normal working forces effecting the conanalogous to the fleeting rod while in normal use, whereby alltendency of distortion is automatically reduced to a minimum.

Another and further object of the presont invention isthe provision of a fixture wherein the foregoing method may be carried ,out with accuracy and rapidity; and also the compensating cally cqualized on .each side of the longitudinal axis of the connecting rod.

. flther and fur/ther objects of the present invention will in'paitt be obvious and will pointed out in the'specification hereinafter following by reference to .the accompanying vdrawings wherein like parts are vrepresented by like characters throughout the several figures thereof.

`Figure l is a perspective view illustrating `the device with the line reamer removed.

Fig. 2 is a plan view showing the line reamer in position. v

er woon'ttlnr, 'ianoon repartir, essroiron trarrooairnnrpor woon'sooirnr, niionn rennen,

Specification of Letters Fatent.

application niet october-a, ieri.

certain new and forces are automati- @NNETNGIROD BEAMER MW) THE Patented Jin-inetd. indd.

Fig. 3 is a side elevational view of the device as shown in Fig. 2.

Fig. l is a detail view of the reainer shaft holderto facilitate adjusting the reainer head.

Fig. 5 is a detail view of the connecting rod head support and adjustment member. Fig. 6 is a back view showing the device' illustrated in Fig.

Fig. 't is a, view showing a front elevation of 'the device shown in Figs. 5 and 6.

Fig. 8 is a plan viewfof in Figs. 5,*6'and 7.

Fig. 9 is a view of the reamer shaft with the reamer removed.

the device shown .tort or titl Fig. l0 is a view of the holding pin for Y.

the small end of thel connecting rod.

Fig. ll is a detail View of the mounting for the compensating pressure yoke or bar. Heretofore in the art it has been the custom to drill or ream 'connecting rod bearings without use of special fixtures 'for positioning such bearings and where particularly close4 fitting parts for' fine work were desired the bearings were scraped by hand. With these methods it is obvious that accurate dimensions could not be maintained and the axis of the bearings was not always absolutely perpendicular to the longitudinal axis .of the connecting rod. Where such inaccuracies occur there is a tendency to c ause the connecting rod to slightly bend or whip `thereby cansino" side shocks to the piston and to the cran r. shaft bearings and generally introducing undesirable vibrations in the operation of the engine or like machine.

rFlic present invention entirely overcomes the foregoing difficulties by providing a support which stresses the connecting rod to produce results similar" to the actual workingyforces on the .connecting rod and at the same time accurately alining the connecting rod relative to the axis of the finished bearing so that the axes of both bearings inthe connecting rod are substan the bearing; and also includes adjustable pressure plugs whereby predetermined cornpression forces are brought to bear against lio. Th

` and beyond the a pair ofupstanding arms 6 and 7; the arm a large bearing sleeve 8 and 'A provided with offset portions 10 andare 'drilled adjacent these offset-portions to carry the end of the connecting-rod. After the positioned it is adapted to the suitable reamingdevioe as will be hereinafter described;` y

' One form of apparatus `for carrying.` out the foregoing method comprises a hollow base l which preferablyis'i provided With. vthree feet 2 that are arranged in triangular relationship to form a tlireepoint support.

e .upperlportion of. the base isV surfaced as at sto-comprisea bed on which is seated a bracket 5 which will hereinafter be more fully described.

surfaced bed. 4 is provided the anni is likewise fitted with a smaller'` bearing sleeve accurately ground on their interior surfaces to closely fit a reamerc'ariying shaft, as will be explained later.` The arms 6-and`7'are a stub-shaft 11 that is clamped in position bystubscrews l2. This shaft 1l carries a clamp arm ,14 which is provided on one side with a surfaced button I5 adapted-.to abut v underneathy against the side of the connecting 'rod to be reamed and to'constitute a side thrust abutnient. The clamp ar'm 14 is split and is provided Withaclamp bolt 1' arm may be positioned at suitable intervals upon the shaft 11. The bracket 5 comprises a bed 1'7 which is slotted atlS and l19 to permitlongitudinal adjustment movements of- 4vthe base on' the surfaced bed 4 and enables '.thestubboltsi 2O y and 2l to be operated'to clamp the bracket` very tightly to the bed l.' The bed 4 is provided with a longitudinal keyvvay 22 and the bracket carries on its portion 'a :key 2 y 4tl1at ,its .the keyway 22 whereby 'the bracket Sis/accu- -v rately positioned at all times relatively to thesurfaced bed 4. Side arms integral with the bracket base 17 andare' joined by an lintegral!strengthening' rib 27 construction adapted .a heavy frameprovidedv with.`

shaped vertical yweb 37 integral with and l at right angles tour/.vertical bar 38. The 1 vertical bar 25 and 2G are to 'constitute 'aV rigid to Awithstandtension and-compression forces. The side arms 25 and'26"are/also provided .with bearing sleeves 428 and 29 which. arev accurately ground o`n ,then` interlor surfaces to fit the supportingpin 3.0.

Referring moreparticularly to Figs. 2 and -3 for general construction and Figs.` -5 to 8 for detailed const-1 "uotion,v the"` pressure head 'will now. be described; Thisv pressure headv is mounted very ri/O'idly upon the .base` l by meansof suitabletub'bolts 36 andI comprises a. triangular 38. isprovide,` formed openings in-whicli pressure plugs 39 and 40'; operated screw 41 carries with accurately arel slidable the At the other end of the base' 9. rhese bearing sleeves are.

@whereby the- 56 may l cally ladjust the ends'4 of the supporting A heavy hand ay pressure yoke" 42 thatl bears upon the rounded heads 4l 'and 45 of the pressure plugs 89 and 40. The

maint-ain the yoke in proper positiondover the rounded heads il and 45 of the pressure plugs. This opening 46 isfrelatively largeJ to permit considerable freedom of movement of the yoke, particularly movement in'a -vertical plane. The hand pressure screw ell carries 'a trun-nion` collar 48 which is provided with diametrically opposed sockets into which the conical ends of the trunnion screws 4:9 to fit whereby the yoke l2 is permitted a slight swinging movement in a vertical plane relatively to the pressure screw l1. The t-runnion screws are provided with suitable lock nuts 5l. The hand operated screw -ll projects outwardly sonic distance from the yoke 42and is provided with a head 52 that carries the crossbar 54. Slight bosses are provided on thc sides 'of the vertical bar are accurately machnied to formmiddle portion a supporting cradlethat is mounted'upon thc screw bolt 59 to oscillate about a substantially iorizontul axis. This' cradle carries a pair of oppositely disposed accurately formed supporting blades (i0 that are adapted to sustain the weight of the head 'of the connecting rod and will be later explained. A button 61' constitutes a locknut for the screw bolt 59 and atthc same time comprises a Work face against' which the and 50 are adaptedadjustment-screw 62 bears whereby theyoke be swung o n the pivot bolts to vert-iblades 60'.

In operating thisA device to carry Vout the the-'bearing 65 in the formed, is positionedbetween the side arms 25'and 26 Aof the bracket 5 and the supporting ypin 30 is positioned through the bearing sleeves 284 and' 29.a'nd through the bearing 65 ofT the .small end of the connecting rod '64.

30 accurately fits the bearing 28V, the middle portion Taccul-atelyfits the bearing 65 and the portion'ft accurately fits the bearing 29 so that the small end of the crank shaft is now accurately supported by the' supporting bracket The larger end of the crank shaft carrying the split bearing 69 rests with the turned `bearing in position on the supporting blades 60. The adjustment screw 62 is operated to raise orv lower the supporting cradle 58 to bring the `split bearing 69 into proper vertical positionrelativelyto the axis of the bearing sleeves 8 and 9 on the device. he clamp arm 14 is also positioned with the he portion 66 of the supporting pin portion or ring 70 of the i face of the button against the side .of the connecting rod Where'the device is adjusted to operate upon standardized parts the adjustments just referred to need not be made but once and are thereafter maintained -as standard.

tion in the engine. rl`hese`couneression forces x it will' be noted are applied, through relatively freely movable and equalized parts so that any distortion of the connecting rod is automaticallycompensated vfor andthe forces are applied equallyfon opposite sides of the neutral anis ofthe connecting rod. After the connecting rodis lpositioned as specified the reamer 74C is positioned through the bearing sleeve 8 to bring the blades of the reamer 75 into engagement with the lend of the split bearing 69. 'llhe reamer shaft carries a reamer of the character described in my. pending application Serial No. 179,191, filed July 7, 1917, and is providedfwith a portion 7tS-which accurately fits the large bearing sleeve 8; a middle portion 77 provided. with slots 7 8 to receive the locking 'screws carried by the manier-75; anda smaller portion 7 9 which accurately fits the smaller bearing sleeve 9. 'llhe smaller' portion 79 is of 'such length relative to the other parts as to permit a goodbean ing to be established -between this portion and the bearing sleeve 9 before the cutter blades of the reamer 75 enter the split bear-4 ing 69. its explained in my pen-ding. ap-

' plication referred to on' the reamer, 1t 1s sometimes desirable to adjust the blades diametrically inwardly or outwardly where- -`by the opening may be reamed to required fat rigidly locks therotative 'movement and thereby facilitates dimensions, such as the accurate dimension of the crank shaft upon which the particular split bearing is to operate. rllhe adjustment of the reamer as explained in the reamer application is accomplished by rotating the reamer ring. ln order to facilitate this op eration the portion-76 of thevreamer ,stub shaft `is provided with grooves 80 and the arm- 6 is provided with a rotatable head 81 that carries akey 82 adapted to fit the grooves 8O whenfthe head is lifted against the pressure of the spring bar 85 permitted to "drop into slots 86. 'llhis reainer shaft 7a against the adjustment of the `reamer as specihed. 'llhe rearner-head is*y provided with handles 87. which enable the operator to rotate the which 1s connecting rod Stand the cross- 'roaming the other Iand thereby accurately reani the split bearing The actual use of .the foregoing specified method and. apparatus demonstrates that crank shaft bearings formed in accordance with this method are so related that the aires thereof are substantially parallel and that such bearings wear longer and with less friction than bearings formed by any other known method'.

Realizing that the foregoing specired method may be carried out by constructions diiferin in detail from the apparatus `herein speci cally disclosed, l desire that the disclosure herewith be understood as illustra-` tive and not in the limiting sense.

Having thus described my invention what ll claim is:

1. The method ofreaining connecting rod bearings and the like, comprising supporting the connecting rod by one bearing; coinpressing the connecting rod of its length; and bearing while the connecting rod is under compression.

:2. rllfhe method of roaming connecting rod bearings and the like, comprising supporting one end of the connectin rod by the bea-ring therein; compressing t e connecting rod by applying forces at the other end and on .oppositesides of the neutral airis of the rod; vand ythen reaming the other bearing while the connecting rod isunder stress.

3. 'llhe method of finishing crank shaft bearings for connecting rods andthe like, which consists in supporting the connecting rod, stressing the connecting rod on each side of the neutral axis thereof; and then roaming the crank shaft bearing while the is under stress.

a. 'llhe method of finishing connecting rod bearings and the like, which comprises supporting thevconnecting rod on one end by a .supportinhg'the end of the crank shaft by a member ting the linished.bearing;. then applying balanced forces against the other end of the connecting rod whereby said connecting rod is compressed under equal forces on opposite sidesof-the neutral anisgthen bearing. while the connecting rod is under compression forces;

6. Il`he method of finishing connecting rod bearings and the like, which comprises supn porting the connecting rod and loading the same with an artificial load applied in the in the direction p then roaming the other lll@ lll@

y same direction as the Working load'when'the Y connecting rod is assembledinlat Working tting one bearing;

bearings and the like,

machine; and then reaming a bearing While .the connecting rod is undcrftheartiicial load.,

7. The method of reamingeonne'cting rod porting of the connecting rod by a member and then compressing the connecting rod b vforces applied to each side of the crank shaft bearing; then reaml ing thecrank shaft necting. rod isv under compression forces.

8. The method of reaming connecting rod bearings and the like, comprising` supporting the connecting rod by one bearing; rest- '111g'. the other end `on a compensating cradle;'compressing the connecting' rod in the direction of its' length; and then reaming theother bearing while the connecting rod is-under'compression.

- 9. The method'of reaming connecting rod bearings and the like, comprisingsupporting: one en`d of' the connecting. rod by the bearing' therein resting the other end of the connecting rod on a compensating support; compressing the connecting rod'by applying forces at -the other end and on opposite sides of the neutral axis of the rod;

and then reaming the other the connecting rod is under stress,l

' .10. The method of nishing connecting I rod bearingsand V` a' member substantially' ttin 4 5 rod bearings and the like, supporting one end of the connecting rod;l restingv the other end of the connecting rodv connecting rod on each side off the neutral shaft bear-ing -oii the/connecting rod while the connecting rod is-under stress.

1 1.- Themethodt i-finishingconnecting the like,-which comprises' supportingitheconnecting rod on one endl by (the bearing Tin":theasa'idend;.restingthe ot er end upon aicornpensating support-f; then applying compressicnforces at the! other endof-the coni neoting; rodi and u pon opposite; sides. of the neutral iazsistlereof.; then roaming :th'e crank f shaft bearing while the connecting rod: is

' under' compression forces.

."12L'llheq-1nethod ofnrealiling rodf bearings and the. like, comprisingn- I 'ishin'gftle bearingsidn oneend of the crank of-.thegcrank shaft shaftgsupporting the: end by a 'member fitting. the finishedbearings;

' .supporting-the otherend of; disconnecting rod: upon' a compensating` cradle-a then-.ap-

oppos'itei side'swof '.reaming thel other l plying balanced forcesfagainst theother end .o o-

ofthe connecting rod whereby said conneet ingrodis compressed un'der equal forcesgpn the neutral. axis.; then bearing while they com compressionforcesfg.,

ofn-ishing'conectins! nectinler rod' is'under iR-l The method comprising-` the supbearing While the `conbearing, i While which consists in rod bearings and the like, which comprises supporting one end of the connecting rod by a member substantially fitting one bearing of said connecting rod 5 supporting the other endxof said connecting rod upon a compensating support adapted to oscillate about an axis atsuhstantially right angles to the axis of said bearing; then'colnpressing said counecting rod in the direction of its length; thenreaming the crank shaft bearingwhilc said connecting rod is under compression.'

'14. Themethod of roaming crank shaft bearings for connecting rods and the like, which comprises supporting the connecting rod upon a member substantially. fitting the end ,bearing of the connecting rod; support-- ing the crank shaft bearing end of the connecting rod upon a compensating Amember adapted .to oscillate about an axis at substantially right anglesto theaxis of the first mentioned bearing'then adjusting said crankshaft bearing end in such manner that passes through saia then compressing said direction of its length;

and then reaming said crank shaft bearing concentric With the said predetermined axis.

15. A device for accurately reaming connecting rod bearings and the like, comprising in combination, a base frame, means to support one end of the connecting rod to be reamed, meansto support the other end of said connecting rod, dev ices to artificially load said connecting rod with compression forces .in the' direction of its length, and

means-to ream the crank shaft bearing ofv said connecting rod to a predetermined axis while under said compression forces.

V16.'A devlce for accurately reaming connecting rod bearings and the like, comprismgmcombination, a base frame, a bracket for supporting one end of a connecting rod,-

Ameans to' support the other end of said convnecting rod, means to artificially .loadsaid connecting rod by .thecrankshaftbea .ofsaid connecting .rodgwhile said connecting-rod is under said .compression forces;` l f5- 17. Ai'device for accurately reaming con- --nectingrcd bearings and the like, comprisingiu combination, a base frame,'a bracket adjustably mountedon said base frame, a pin supported bysaid bracket and adapted, to accurately fit van end bearing in Isaid connecting rod, means to support the .o'th r .end' of said connecting rod whereby? the crank shaft bearing therein is definitel 'positionedrelatively to a predeaxis, means to artificially load said 1connectingI rod by compression forces actin longitudinally of said connecting rod, and

compression forces in they direction of its length, and devices to reain .im'eansto -ream said crank shaft bearing coni i rately lit the bearing l axis thereof, means .to compress said connecting necting rod bearings and the like, comprising in combination, a base iframe, a bracket longitudinally adjustable on said base frame, means for guiding said bracket `during adjustments, devices tor locking said bracket in adjusted positions, a supporting pin carried by said bracket and adaptedto accuin the end oif theconnecting rod to be reame'd, means to support the other end ot said connecting rod, devices rod longitudinally and on opposite sides ot lthejneutral .tor reamingsaid connecting rod whileunder compression forces.

19. lin a device for accurately reaining connecting rod bearings and the like, combination ot a base traina.' a bracket mounted upon said base traine, accurately' V.iiorined bearing sleeves carried by ,-said lrnacket, asupporting. pin adapted to iit within said Abearing sleeves and having a portion adapted to accurately tit the bearing the end ot said vconnecting rod to be the other end or' connecting. rod to be -reamed whereby the crank shaft bearing therein is positioned relatively to a' predetermined airis,

' compress said connecting rod longitudinally,

and devices to ream said connecting rod concentricnwith said predetermined a'Xis while said connecting rod is under compression. forces.

20. A Idevice oit the character specied,

comprising in combination, a lbase* frame,

,means to supportone end at. a connecting rod tobereamed, compensating means for -supportingthe other end of said connecting vrod, means to-.articially load said` connecting rodwith compressioniorces acting in the direction ot its length, means to contact with .the side ofthe connecting rod at `the end supported upon the compensating means to take up side 'thrusts during the reaming operation, and means to ream the crank shatt bearing while said connecting rod is under said compression Iforces.

2l. A device I nectipg rod bearings and the like, comprising lor accurately roaming coni in combination, avbase traine, a pin adapted vto accurately ysaid connecting rod whereby said connecting t a bearing in thev end ot rod is supported against endwise thrusts, a compensatin "cradle adapted to support the other end o said connectingA rod, the axis ot said compensating cradle being at substantially right angles to the axis oi said pin, means to compress said.v connecting rod in the direction of its length, and means to ream said connecting rod while under conipression forces 9,2. idevice necting rod bearings and the like, comprising` in combination, a base Jframe, a supporting pin adapted to accurately t,thebearing in one end ot theconnecting rod to'loe the 'means to' for accurately reaming con-v reained and constituting the sole support for one end o -the said connecting rod, means to support the other end of said connecting rod, said means comprising a yoke pivoted on tlieaxis the axis of' said pin, adjustable means :tor

substantially parallel tov raising or-lowering said yoke, devices tor compressing said connectingv rod iiifthe diwhereby the bearing to tively to a predetermined airis, devices-tor Y compressing said connecting rod in the direction of its length, and means for reaming said bearing concentric with said predetermined aXis While said connecting rod is under said compression forces.

24. A device for reaming connectingffrod bearings and the like, comprising incoiiibination, means to support one vend oi vsaid connecting rod, a yoke pivotally mounted upon an axis atl substantially right angles to the longitudinal axis ot the connecting rod to be roamed, a cradle carried by said yoke', supporting members on said `cradle and adapted to engage and supporton'e end "of said connecting rod, means to secure said connecting rod in position on said cradl e and devices to ream a bearing in said connecting rod while so positioned.

25. A device tor accuratly reaming connectinglrod bearings and the like, comprising in combination, means to support said connecting rod with the axis of the bearing positioned relatively to Aa predetermined axis, means :for stressing said connecting rod longitudinally, and devices for reaming a bearing of said connecting rod while in a stressed condition.

26: A device for accurately reaming con-l necting rod bearings and the like, comprising in combination, means to supporta connecting rod, a pair of pressure plugs, comicc pensating devices adapted to distribute pressure equallyl between said plugs, whereby the connecting rod is stressed on each side of thev neutral axis thereof,'and means tor reaming said. connecting rod while under stress. y

27.. A. device for accurately reaming connecting rod bearings and the like and coin'- prising means to support the connecting rod to Ibe reamed, pressure devices comprising pressure plugs having rounded heads, a cornpensating bar resting on said rounded heads, means for loading said compensating bar whereby the load is distributed to saidpressure plugsto compressv the connecting rod forcesdeveloped' tli ing rod while undei` i shaft on each side of the neutral axis thereof, and means topream the connectingrod while under compression forces.

y rod, pressureplugs adapted to bear against the end of said con.- necting rod, acompensating bar bearing .on said pressure plugs, a pressure-screw, pivotal means connecting said `pressure screw with said vcompens tmg bar whereby the screwgare distribute? to said pressure plugs whereby the .connecting rod is stressed,and means for reaminga bearing in the connectstress. 29. A; device for..,},reaming connecting rod bearings and thefiilie, cond' rising in combination, means to lsupporta connecting-rod, devices for .positioning roamed relatlvely to a -predetermined axis, means-for stressin Asaid connecting rod, `a pair-of guide mem coperatlve with said guide members in such manner that the axis off'aid reamer shaft exactly coincides With t e predetermined axis whereby the operation of said reamer reaans'thesaid bearipg concentric 'with the said predetermined axis.-

A evice for reaming connecting rod.

hearings and the like, comprising Lin combinat-ion, means to supportthe connecting rod,

,sdsjthrust means Comprising an adjustable anat-,ment adapted 'to contact .with .the side 01ths. .0neecticg we adjacent' ths'bssrn sfrssrsd, ds'vices for com' rsssing sei' connecting rod' .in the direction .of .its-length,

A 'i rsamsrgdssgon Opposite-'sides sfsaidsonnectlngrod, and areamer shaft ooperative With- `vsaid mamar "guides .wessi Y a shft'bseng msybs'rsalissd said connecting rediris Bilder een? shisssssmlin @devies ofthe@ the Genaisse@ eflasans i" ber' to be reameddevices jf ,sits/assed liminer evice for ream'ingconnecting `rod bearings andthe like, comprising means to. th support aconnecting o ugh the action .of said necting rod bearings and e bearing-to be' mlned axis,

ers, and a. reamer shaft' `mountedin said second pair `vyorking .conditions of the connecting rod,

,',anddevicesto ream certain of said connectlving rod bearings While said connecting rod fis clamped` as specified.

zii-,necesa guides to reamsaid bearing concentric with said axis. A v

'32. A. device of the character described, comprising. a supportingpin adapted to t ve bearing, in one end o a connecting rod andthe like, reamer guides having an axis parallel with the axis of said pin, means to position a connecting rod in such manner that the crank shaft bearing is definitely pos' sitioned relatively to said predetermined axis, meansto stress said connecting rod, anda reamer shaft coperative with said reamer guides wherebyfthe operation of. said reamer shaft finishes the crank shaft bearing concentric'With said predetermined axis.

33."A device for, accurately reaming' con thelike, comprislng in combination, means to support a 'connecting rod with the crank shaft bearing ac curately positioned relatively to a predetermeans to guide a reamer shaft with the axis thereof coincident With" the .said predetermined axis, and holding de ,vices to prevent the rotation of said'reamer shaft whereby the reamer head may be operated to adjust theblades thereof. i

34. A. .device of thencharacter described, comprising in combination, apair of upstandingarms, asupport-ing pin mounted -in said upstanding arms and having a portion to exactly lit a bearing in aafsuitable connecting rod or the like, a second pair of upstanding arms, reamer shaft guide, Hearings of upstanding arms whereby -a Vreamer shaft Will'be accurately guidedon a predetermined axis, means to position a connecting rod With a bearing thereof 'adjacent said predetermined axis, and devices-for appl nally of said connectinfr rod and on each side of said crank shaft tbearing.

l35. In a Vdevice for reaming connecting rod bearings and the like, means Aat the end ofthe connecting rod to support and clamp .90 ying pressure longitudiksaid connecting rod in the direction of its len Ah whereby Said connecting rod is free manner analogous to actual ALBERT a. ManTELn 

